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BD² = AD² + AB²
BD² = 5² + 5²
= 25 + 25
BD = √50
BD = 5 √2 cm
alas Δ BDH = BD = 5√2 cm
tinggi Δ BDH = DH = 5 cm
maka L = 1/2 .a. t
= 1/2 . 5√2 . 5
= 25√2 atau 25 √2 cm²
2 2
2) AC² = AD² + CD²
= 9² + 12²
= 81 + 144
AC = √225
AC = 15 cm
AB² = AC² + BC²
20² = 15² + BC²
BC² = 400 - 225
BC = √175
BC = 5√7 cm
3) tinggi = t
maka t² = 5² - 3²
= 25 - 9
t = 16
t = 4 m
4) i) 3 , 4, dan 5
ii) 6, 8, dan 10
iii) 8, 15, dan 17
iv) 10, 24, dan 26
v) 15, 20, dan 25
5) d = 3√2 cm maka sisi persegi d² = 2s²
(3√2)² = 2s²
2s² = 18
s² = 18/2
s = √9
s = 3 cm
semoga membantu...jangan lupa kalo soalnya banyak pointnya ditambah..hehehehe