6. Two ladders are leaning against a vertical wall at the same angle.
The 4·2 m ladder extends 2·4 m up the wall.
How far up the wall will the 7 m ladder extend?
8. A tree with a height of 4·5 m casts a shadow 15 m long on the ground.
Another tree beside it casts a shadow which is 20 m long at the same time of day.
(i) Draw a sketch to represent both trees and their shadows.
(ii) Find the height of the second tree. 7 m 2.4 m 4.2 m
9. A pool ball is hit at position A shown in the diagram. It is defl ected off the side wall of the table at position B and then travels to position C.
Calculate the distance travelled by the ball from A to C. Note: the angle the ball hits the wall and bounces back off it are the same.
7. Erica is 1·60 m tall. Her shadow is 0·25 m long.
Her shadow extends to the end of a tree’s shadow when she stands 4·75 m from the tree.
Calculate the height of the tree. 4 cm A C 6 cm 3 cm B
1.6 m 4.75 m 0.25 m Revision questions
30A Core skills 1. Find the measure of the angle labelled A in each of the following. Justify your answer in each case. (ii)
(i) (i)
(i) (i) (i) (i)
A A A
122° A
(iv) (iv) (iv)
(iv)
(iv) J J(iv) J
J
O O O O
L L
482 O L L Linking Thinking 1 A 122°122° 122° 122° A 122° J