Answer:
A = bh/2 A = 8x12/2
8 x 12 divided by 2 = 48
the area of the triangle is 48
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a*2 + b*2 = c*2
8*2 + 12*2
64+b2=144
b2=144−64
b2=80
b=√80
b=√16√5
b=4√
A=12bh
A=12(8)(4√5)
A=4(4√5)
A=16√5
A≈35.7771
thus answer is 35.7771
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A) l*2 = 81 ⇒l = √81 =9
4×9 = 36cm
B)
area divided by 2 because its half the square so
81 divided by 2 = 40.5
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3 ig
a2+b2=c2 52+h2=202 25+h2=400 2=375
h=√375
h=5√15cm
h=19.36cm
A = 97.8
