bantu tinggal no 33. please
Matematika
harsya6
Pertanyaan
bantu tinggal no 33. please
1 Jawaban
-
1. Jawaban jpallo
33a) AC merupakan diameter, maka ∠B dan ∠D = 90°, shg
AC = √(AB² + BC²)
= √(49 + 576)
= √625
= 25 cm
CD = √(AC² - AD²)
= √(625 - 225)
= √400
= 20 cm
b) s = 1/2 kell Δ
= 1/2 (AB + BC + AC)
= 1/2 (7 + 24 + 25)
= 28
L ΔABC = √[s(s - AB)(s - BC)(s - AC)]
= √[28(28 - 7) (28 - 24) (28 - 25)]
= √[28 (21) (4) (3)]
= √7.056
= 84 cm²
L ΔABC = 1/2 x a x t (t = tinggi = BO)
84 = 1/2 x 25 x t
t = 6,72 = BO
Jadi BD = 2 x BO ===> BD = 2 x 6,72 ===> BD = 13,44
semoga membantu ya