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2(p+l) = kliling
P+l = 70 /2
4x-4+2x+3= 35
6x-1=35
6x=36
x=6
P=4x-4=20cm
L=2x+3=15cm
Luas=PxL= 20x15=300cm²
2.
4sisi = kliling
S = 52/4= 13cm
1/2BD²+1/2AC² = S²
1/2BD² = S²-1/2Ac
= 13² - 5²
= 169-25
1/2BD² = 144
1/2BD= √144= 12
BD= 12 x 2 = 24cm