ini apa ya? bisa tolong jelaskan??

MATH Junior High School

Answer :
15||

The area = 1/2 AB . BC . Sin 150°
The area = 1/2 . 16 . 10 . 1/2
The area = 40

16||

Use Pythagoras...
AE = √[AD² - DE²]
AE = √[15² - 6²]
AE = √[225 - 36]
AE = √189
AE = √[21.9]
AE = 3√21 cm

DF/DE = DC/AD
x/6 = 10/15
15x = 60
x = 60/15
x = 4 cm

17||

Perimeter = 36
a + a + 10 = 36
2a + 10 = 36
2a = 36 - 10
2a = 26
a = 26/2
a = 13 cm