Tolong bantu jawab kak :)
Penjelasan dengan langkah-langkah:
3. total sudut segitiga = 180°
nilai x :
x + 15 + 3x + 10 + 35 = 180
x + 3x + 15 + 10 + 35 = 180
4x + 60 = 180
4x = 180 - 60
4x = 120°
x = 120/4
x = 30°
besar sudut P :
3x + 10°
3(30) + 10
90 + 10
= 100°
4. luas segitiga ACD
rumus luas segitiga = 1/2 x alas x tinggi
= 1/2 x 4 x 10
= 1/2 x 40
= 20 cm²
5. total keliling segitiga = 60 cm, maka
4x + 3x + (4x + 5) = 60
11x + 5 = 60
11x = 60 - 5
11x = 55 cm
x = 55/11
x = 5 cm
luas daerah segitiga = 1/2 x alas x tinggi
alas : 3x
= 3(5)
= 15 cm
tinggi : 4x
= 4(5)
= 20 cm
luas =
1/2 x 15 x 20
1/2 x 300
= 150 cm²
[answer.2.content]
