tolong kerjakan dengan baik

14) jawaban = 180 (c)
[tex]x + y = 27 \\ x - y = 3 \\ - - - - - + \\ 2x = 30 \\ x = 30 \div 2 = 15 \\ y = 27 - 15 = 12 \\ x \times y = 12 \times 15 = 180[/tex]
15) jawaban = 60 (d)
sisi miring =
[tex]36 - 10 = 26 \div 2 = 13 \: cm[/tex]
t segitiga
[tex]b {}^{2} = c {}^{2} - a {}^{2} \\ b {}^{2} = 13 {}^{2} - 5 {}^{2} \\ b {}^{2} = 169 - 25 \\ b {}^{2} = 144 \\ b = \sqrt{144} = 12[/tex]
luas segitiga =
[tex] \frac{1}{2} \times 12 \times 10= 60 \: cm {}^{2} [/tex]
16) jawaban = 52 (a)
[tex]20 - 14 = 6 \div 2 = 3 \: cm[/tex]
t trapesium =
[tex]r = 14 \div 2 = 7 \\ t = 11 - 7 = 4[/tex]
sisi miring trapesium =
[tex]c {}^{2} = a {}^{2} + b {}^{2} \\ c {}^{2} = 4 {}^{2} + 3 {}^{2} \\ c {}^{2} = 16 + 9 \\ c {}^{2} = 25 \\ c = \sqrt{25} = 5[/tex]
Keliling bangun=
[tex]k = \frac{1}{2} \times \frac{22}{7} \times 14 + 20 + 5 \times 2 \\ k = 22 + 20 + 10 = 52[/tex]
semoga membantu