jawab A dan B : tentang Segitiga

A.

alas = 10 cm
sisi miring = 14,1 cm

Tinggi = √ 14,1² - 10²
Tinggi = √ 198,81 - 100
tinggi = √ 98,81
tinggi = 9,9 cm

lp = (1/2) . a. t
lp = (1/2) . 10 . 9,9
lp = 5 . 9,9
lp = 49,5 cm²

k = a + sisi miring + t
k = 10 + 14,1 + 9,9
k = 34 cm

B.

Tinggi = 6,9 cm
sisi miring = 8 cm

alas = √ sisi miring² - tinggi²
alas = √ 8² - 6,9²
alas = √ 64 - 47,61
alas = √ 16,39
alas = 4,04 cm

lp = (1/2) . a . t
lp = (1/2) . 4,04 . 6,9
lp = 2,02 . 6,9
lp = 13,9 cm²

k = alas + sisi miring + tinggi
k = 4,04 + 8 + 6,9
k = 18,94 cm