luas Dan keliling nya pake cara!

(3) L(layang layang)=1/2×d1×d2
=1/2×(15+6)×(6+6)
=1/2×21×12
=126cm^2
L○=3;14×r^2
=3,14×10×10
=314cm^2
Lstengah○=1/2×314=157cm^2
L total=Lstengah○+L (layang layang)
=157+126=283cm^2

Kliling layang=2×(sisi A + sisi B)
sisi A=a^2+b^2
=6^2+15^2
=36+225=261

[tex] \sqrt{261} [/tex]
=16,1cm
kliling layang=2×(16,1+10)
=52,3cm
kliling stengah○=3,14×r
=3,14×10
=31,4cm
kliling total=kliling layang+kliling stengah ○
=52,3+31,4=83,7cm
maaf kalo salah

(4) L.segitiga=1/2×a×t
=1/2×14×7
=49cm^2
kliling segitiga=sisi 1+sisi 2+sisi 3
=14+7+7
=28cm
L.stengah○=(22/7×r×r):2
=(22/7×7×7):2
=77cm^2
kliling stengah○=(1/2×22/7)×D
=22cm
L.total=L.segitiga+L.stengah○
=49+77
=126cm^2
kliling total=kliling segitiga+kliling stengah○
=28+22
=50cm