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Answer:
41
Explanation:
You have to use Pitagoras.
a^2 + b^2 = c^2
12^2 + 12^2 = c^2
144 + 144 = c^2
288 = c^2
c = √288 = 16.9
P triangle = 16.9 + 12 + 12 = 40.9
Rounded is 41
72
so the second one
Triangles area= Base x Height ÷ 2
12x12= 144
144÷ 2 = 72