Question

9.
In triangle ABC, AB : BC = 3 : 4, BC: AC= 5:4
a) If AB= 30 cm, what is the length of BC ?
b) If BC= 20 cm, what is the lengths of AB and AC ?
c) What is AB : BC: AC ?​

Answer 1

Answer:

answers

a. bc 40cm

b. ab 15cm ac 16cm

c. 15:40:16

Answer 2

Answers:

a) Unitary Method, then, 1 u.= $\frac{30}{3}$ = 10 cm. So, length of BC = 10*4 = 40 cm.

b) Unitary Method, then, 1 u.= $\frac{20}{4}$ = 5 cm. So, length of AB = 5*3 = 15 cm. If BC = 20 cm then, Unitary Method, $\frac{20}{5}$ = 4 cm. So, length of AC = 4*4 = 16 cm.