Question

Tolong kerjakan nomor 24 dan 25 pakai cara ya

Answer 1

24. AD= 17 cm
AC= 20 cm --->> diagonal 1
OC= 5 cm
AO= 20-5= 15 cm

(OD)^2= (AD)^2 - (AO)^2= (17)^2-(15)^2= 64
OD=√64= 8 cm

DB= 2*8= 16 cm --->> sebagai diagonal 2

L= (d1*d2)/2= (20*16)/2= 10*16= 160 cm^2
Jawaban: B

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25. trapesium
a=SR= 8 cm
c=PS=QR= 10 cm
b= PQ= 32-2(4)= 32-8= 24 cm
x= (PQ-SR)/2= (24-8)/2= 16/2= 8 cm

t^2=c^2-x^2= (10)^2-(8)^2= 100-64= 36 cm
t= √36= 6 cm

Lt= Luas trapesium
Lt= (a+b)*t/2= (8+24)*6/2= (32)*6/2= 96 cm^2



Persegi Panjang
Lp= P*L= 32*12= 384 cm^2


Luas arsir=Lp-Lt= 384-96= 288 cm^2
Jawaban: A

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