The content is just an excerpt from the complete note for JSS2 First Term Basic Technology Lesson Note – Tangent and Normal to a Circle. Check below to download the complete PDF
WEEK NINE
CLASS: JS TWO
TOPIC: CIRCLES (cont’d)
SUB-TOPICS:
- Tangent and Normal to a circle
- Construction of Tangent and Normal to a circle
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
Sub-Topic I: Tangent and Normal to a Circle
A tangent is a straight line that touches the circumference of a circle. It is usually at right angles to the radius of the circle.
A normal is a straight line which joins the center of a circle to the tangent at the point of tangency.
Evaluation
Draw a circle indicating its tangent and normal to the tangent
Content Development (NOTES FOR SECOND LESSON/PERIOD TWO)
Sub-Topic II: Construction of Tangent and Normal to a circle
Tangent to a circle from a point on the circumference
Steps
- Draw the circle with center O
- Mark the given point A on the circumference
- Join OA and extends it outwards
- With A as center and radius OA, draw an arc to cut the extended line at B
- The perpendicular bisector of OB is the required tangent
- CD is the tangent to the circle at point A while OB is the normal
Tangent to a circle from a given point outside the circle
Steps
- Draw the given circle with center O
- Locate point A outside the circle
- Draw line OA
- Construct a semicircle on OA to intersect the given circle at B
Line AB is the required tangent to the circle
To gain full access to the note: DOWNLOAD FILE
