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=100+ 260
=360cm2
itu 13nya pake triple phytagoras
= 10 x 10
= 100cm²
K.alas = 4 x s
= 4 x 10
= 40cm
s = √12² + 5²
= √144 + 25
= √169
= 13cm
L.permukaan = L alas + 1/2 x K alas x s
= 100 + 1/2 x 40 x 13
= 100 + 260
= 360cm²