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a=17cm
e=30cm
1/2 e=15cm
(1/2 e)² +(1/2 f)²=a²
(1/2f)² =17² -15² =289 -225 =64
1/2 f=√64
1/2 f=8
f=2*8
f=16 cm
P=ef/2
P=30*16/2
P=240 cm²
2.
d=2√3
P=d²/2 ( kwadrat jest rombem)
P=(2√3)²/2
P=4*3/2
P=6 [j²]