Question

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Answer 1

A-)8²√3/4 = 64√3/4 = 16√3 m²

B-)4²+h²=12² ==> 16 + h² = 144 ==> h² = 128 ==> h = 8√2
A = 8*8√2/2 ==> A = 32√2 m²

C-)p = (4 + 9 + 11)/2 = 24/2 = 12
A² = 12*(12 - 4)*(12 - 9)*(12 - 11)
A² = 12*8*3*1 = 288
A = 12√2 m² 

D-)tg 60º = h/12 ==> 12√3 = h ==> A = 12√3*12/2 ==> A = 12*6√3 ==> A = 72√3 m²

E-)2² + x² = 6² ==> x² = 6² - 2² ==> x² = 32 ==> x = 4√2
y² + x² = (4√6)² ==> y² = 96 - 32 ==> y² = 64 ==> y = 8
b = 8 + 2 ==> b = 10
A = 10*4√2/2 ==> A = 20√2