Question

Luas segitiga. = 800cm kuadrat
tingginya = 4 kali alasnya
tentukan panjag alas & tingginya

Answer 1

Tinggi = 4a
alas = a

L = alas x tinggi x 1/2
800 = 4a x a x 1/2
800 = 4a² x 1/2
800 = 2a²
800 : 2 = a²
400 = a²
√400 = a
20 = a

tinggi = 4a = 4 x 20 = 80 cm
alas = a = 20 cm

Answer 2

T = 4a

L = a.t/2
800 = a.4a/2
800.2 = 4a²
1600 = 4a²
a² = 1600/4
a² = 400
a  = √400
a  = 20

t = 4a = 4.20 = 80 cm