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a)
e=4√6
f=?
f²+(2√6)²=7²
f²=49-24
f²=25 /√
f=5
P= 1/2 x 4√6 x 5 =10√6
obw = 7 x 4 = 28
b)
a= 12+10+12= 34
h² + 12² = 15²
h² = 225 - 144
h²=81 /√
h =9
P= 1/2 x (34+10) x 9=22 x 9 = 198
Obw = 15 x 2 + 34 + 10 = 74