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52=4.s
s=52:4=13
misalkan belah ketupatnya adalah Abcd
Jika oc=1/2.10=5
dc=13 (dari s yg diatas)
maka od=√13²+5²
=√169-25
=√144=12
luas belah ketupat=10×24/2
=120 cm²
3. f(x)=px+q
f(2)= 2p+q=3
f(-4)= -4p+q=9
________ -
6p= -6
p= -1
2p+q=3
2(-1)+q=3
q=3+2=5
f(8)= (-1)(8)+5
= -8+5
= -3