Question

solve this maths problem
no swap ​

Answer 1

Answer:

By Pythagoras theorem

AC²=AB²+BC²

15²=9²+BC²

225-81=BC²

144=BC²

√144=BC

12=BC

BC=12cm

Area of triangle =base*hieght/2

Area =12*9/2

Area =6*9

Area =54cm²

Answer 2

Answer:

BC = 12 AND Ar(ΔADE) = 27 cm^2

Step-by-step explanation:

By Pythagoras theorem

Let BC = X

15 x 15 = X^2 + 9 x 9

225 = X^2 + 81

X^2 = 144

X = 12

Ar(ΔABC) = 1/2 x 9 x 12

= 9 x 6

54 cm^2

∵ D and E are mid points

2Ar(ΔADE) = Ar(ΔABC)

Ar(ΔADE) = 27 cm^2