Question

50points!!!!!!!!!help me with questions no. 12 ❤❤❤❤❤

Answer 1

(15).
According to Area theorem
If two triagles are similar then ratio of their area is equal to square of ratio of any pair of corresponding sides.

Area of ΔABC / Area of ΔPQR = (BC / QR)^2
81 / 144 = (BC / 6)^2
9 / 12 = BC / 6
BC = 6 × 9 / 12
BC = 4.5 cm

Answer 2

$\huge\mathfrak\pink{Answer}$

According to Area Theorem.

If two triangles are similar then ratio of their Area is equal to square of ratio of any pair of corresponding sides.

Area of ∆ ABC / Area of ∆ PQR = (BC / QR)²

84 /144 = (BC/6)²

9/12 = BC /16

BC = 9×9/12

BC = 4.5cm