solve this maths problem
no swap
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Answered by
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
Answered by
1
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
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