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Luas persegi panjang - luas trapesium
Luas persegi panjang :
19 × 14 = 266cm²
luas trapesium :
( a + b) / 2 × tinggi trapesium
a = 19cm
b = 7 cm
t = 10² - (( 19 - 7) / 2)²
t = 100 - ( 12/2)²
t = 100 - 6²
t = 100 - 36
t = √ 64
t = 8
luas trapesium :
( 19 + 7)/2 × 8
:26/2 × 8
: 13 × 8
: 104cm²
luas bangun tersebut :
L. Persegi panjang - L. Trapesium
: 266 - 104
: 162 cm² ( c)
semoga membantu yaa.. :-)