Question

The areas of two similar triangles ABC and PQR are 25 cm sq and 49 cm sq . If QR is 9.8 cm then find BC

Answer 1

Answer:

BC = 7 cm

Step-by-step explanation:

first we need to find the ratio of areas

25:49

Now because we want a length we have to square root the ratio

$\sqrt{\frac{25}{49} } =\frac{5}{7}$

Time to cross multiply to find the length

$\frac{5}{7} =\frac{x}{9.8} \\ 7x = 49\\ x = 7$