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=√169-25
=√144
=12
luas alas = s x s
= 10 x 10 = 100
luas bidang tegak = 4 ( axt/2)
= 4 ( 10 x 12/2)
=4(60)
=240
luas seluruh = 100 + 240 = 340
t² = 13² - 5²
t² = 169-25
t² = 144
t = √144
t = 12 cm
L = luas alas + 4.sisi tegak
= 10² + 4.10.12/2
= 100 + 240
= 340 cm²