1)
Cari sisi alas
Luas = 100 cm²
s² = 100
s = 10 cm
Cari tinggi segitiga
t² = 13² - (1/2 x 10)²
t² = 13² - 5²
t² = 169 - 25
t² = 144
t = 12 cm
Luas sisi limas
= Luas alas + 4 x luas segitiga
= 100 cm² + 4 x 1/2 x 10 x 12
= 100 cm² + 240 cm²
= 340 cm²
______________________
2)
Cari tinggi segitiga pada alas panjang
t² = 12² + (1/2 x 18)²
t² = 12² + 9²
t² = 144 + 81
t² = 225
t = 15 cm
Luas segitiga 1
= 1/2 x 10 x 15
= 75 cm²
tinggi segitiga pada alas lebar
t² = 12² + (1/2 x 10)²
t² = 12² + 5²
t² = 144 + 25
t² = 169
t = 13 cm
Luas segitiga 2
= 1/2 x 18 x 13
= 117 cm²
Luas limas
= Luas alas + 2 x Luas Segitiga 1 + 2 x Luas segitiga 2
= (10 x 18) + 2(75) + 2(117)
= 180 + 150 + 234
= 564 cm²
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
1)
Cari sisi alas
Luas = 100 cm²
s² = 100
s = 10 cm
Cari tinggi segitiga
t² = 13² - (1/2 x 10)²
t² = 13² - 5²
t² = 169 - 25
t² = 144
t = 12 cm
Luas sisi limas
= Luas alas + 4 x luas segitiga
= 100 cm² + 4 x 1/2 x 10 x 12
= 100 cm² + 240 cm²
= 340 cm²
______________________
2)
Cari tinggi segitiga pada alas panjang
t² = 12² + (1/2 x 18)²
t² = 12² + 9²
t² = 144 + 81
t² = 225
t = 15 cm
Luas segitiga 1
= 1/2 x 10 x 15
= 75 cm²
tinggi segitiga pada alas lebar
t² = 12² + (1/2 x 10)²
t² = 12² + 5²
t² = 144 + 25
t² = 169
t = 13 cm
Luas segitiga 2
= 1/2 x 18 x 13
= 117 cm²
Luas limas
= Luas alas + 2 x Luas Segitiga 1 + 2 x Luas segitiga 2
= (10 x 18) + 2(75) + 2(117)
= 180 + 150 + 234
= 564 cm²