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Stage 5.1-3

5.06 Tangents and secants

Worksheet
Angles and tangents
1

In the given diagram, AC is a tangent to the circle with centre O:

State the size of angle x.

2

In the given diagram, RS is a tangent to the circle with centre O:

Find the size of angle x.

3

In the given diagram, JL is a tangent to the circle with centre O:

If JO = 20 and JK = 16, find the length of the radius OK.

4

Find the size of angle x in the given diagram:

5

In the given diagram, AC is a tangent to the circle:

Find the size of angle n.

6

In the given diagram, PQ is a tangent to the circle:

Find \angle YZT.

7

In the given diagram, PT is a tangent to the circle with centre O:

Find the size of angle b.

Show all working and reasoning.

8

In the given diagram, DE is a tangent to the circle:

Find the size of angle x.

Show all working and reasoning.

9

In the given diagram, PT is a tangent to the circle:

Find the size of angle f.

Show all working and reasoning.

10

In the given diagram, both AB and AC are tangent to the circle with centre X:

Prove that AB = AC using congruent triangles.

Show all working and reasoning.

11

Solve for the pronumerals in the following diagrams:

a
b
12

Two tangents BA and BC are drawn from an external point B to the circle with centre O:

Find x.

Show all working and reasoning.

13

In the following diagram, AB, BC and AC are all tangents to the circle:

Find p, the perimeter of \triangle ABC.

14

In the diagram, tangents AB and AC meet at the external point A:

Find the size of angle x.

Show all working and reasoning.

15

In the diagram, TU and TV are tangents to the circle with centre O:

Find the size of \angle SUV.

Show all working and reasoning.

16

In the diagram AB is a tangent to the circle and \angle BCD = 106 \degree:

Find the size of angle x.

Show all working and reasoning.

17

In the given diagram, CD is a tangent to the circle:

Prove that CD^{2} = CA \times CB using similar triangles.

Chords and secants
18

In the diagram, chords AB and DC are produced to an external point P at which they intersect:

Prove that PB \times PA = PC \times PD using similar triangles.

19

For each of the following, determine the exact value of x:

a
b
c
d
e
20

For each of the following diagrams, find the exact value of x:

a
b
c
21

In the diagram, points A, B, C and D lie on a circle, and AC and BD intersect at point E:

Prove that AE \times EC = BE \times ED using similar triangles.

22

Find z in the given diagram, correct to three decimal places.

23

Find the exact size of the radius, r, of the given circle:

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Outcomes

MA5.3-17MG

applies deductive reasoning to prove circle theorems and to solve related problems

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