Luas seluruh permukaan limas alasnya berbentuk persegipanjang berukuran 18 cm x 10 cm dan tinggi limas 12 cm adalah ….cm2 (centimeter persegi)

Luas seluruh permukaan limas alasnya berbentuk persegipanjang berukuran 18 cm x 10 cm dan tinggi limas 12 cm adalah ….cm2 (centimeter persegi)
A. 564
B. 414
C. 364
D. 372

ini mesti nyari 2 macam tinggi segitiga

tinggi yang pertama ketemy 15 cm:

12, 9, 15

dan tinggi yang kedua itu 13 cm

12, 5, 13

2 tinggi segitiganya kan udah ketemu, sekarang tinggal dihitung deh

L1=18×10
=180 cm^2

L2=1/2×10×15
=75cm^2

L3=1/2×18×13
=117cm^2

Ltotal=L1+2L2+2L3
=180+2(75)+2(117)
=564cm^2

Rekomendasi lainnya :

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