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Definition and 90 Deg
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
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Definition and 90 Deg
What is it?
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
In simple words
- From a point on the circle, exactly one tangent.
- one point of contact
- touches at one point
- radius perp tangent
Important terms
Definition And 90 Deg: From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
What you should learn
- Define and explain definition and 90 deg.
- Apply definition and 90 deg to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Examples
- one point of contact
- touches at one point
- radius perp tangent
CORE UNDERSTANDING
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
EXAM APPLICATION
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Recommended for Class 10
Full school-level explanation
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
Learn the idea, then use it:
WHAT — DEFINITION AND 90 DEG
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
CORE UNDERSTANDING
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
Remember
- one point of contact
- touches at one point
- radius perp tangent
Examples
- one point of contact
- touches at one point
- radius perp tangent
- DEFINITION AND 90 DEG: From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest pat
EXAM APPLICATION
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Remember
- correct term
- chapter link
- clear application
Examples
- Define first
- Show the rule or evidence
- Check units, labels, and conclusion
Remember
- one point of contact
- touches at one point
- radius perp tangent
- keep the ideas separate
- one point of contact
- touches at one point
- radius perp tangent
- correct term
Deeper understanding
Go beyond memorising Definition and 90 Deg. Connect the definition to reasons, relationships, exceptions, and exam wording.
Common mistakes
Exam focus
Core Idea
Key Points
Simple Check
How to Answer
Exam focus
Quick revision
- one point of contact
- touches at one point
- radius perp tangent
- keep the ideas separate
- Definition And 90 Deg: From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it
- WHAT — DEFINITION AND 90 DEG: From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it
Do not merge definition and 90 deg with a neighbouring idea that uses a different definition, rule, or method.
For long answers on Definition and 90 Deg: define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- one point of contact
- touches at one point
- radius perp tangent
- keep the ideas separate
Important formulas
- one point of contact
- touches at one point
- radius perp tangent
Common exam traps
- Do not merge definition and 90 deg with a neighbouring idea that uses a different definition, rule, or method.
- Do not invent a formula, fact, unit, or diagram label that the chapter does not support.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Do not merge definition and 90 deg with a neighbouring idea that uses a different definition, rule, or method.
- Mistake
Do not invent a formula, fact, unit, or diagram label that the chapter does not support.
- Mistake
Do not merge definition and 90 deg with a neighbouring idea that uses a different definition, rule, or method.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
one point of contact
touches at one point
radius perp tangent
keep the ideas separate
From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
- Definition
- From a point on the circle, exactly one tangent. The radius is the perp from O to the tangent, so it is the shortest path from O to the line.
- Example
- one point of contact
- Critical warning
- Do not merge definition and 90 deg with a neighbouring idea that uses a different definition, rule, or method.
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Exam Practice
Define
Q1. Define Definition and 90 Deg.
Explain
Q2. Explain: CORE UNDERSTANDING.
Example
Q3. Give one clear example of Definition and 90 Deg and say why it fits.
Mistake
Q4. State one common mistake students make about Definition and 90 Deg.
Exam note
Q5. Write a short exam note on Definition and 90 Deg: definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.