Question

Please help with any of the 3!

Answer 1

Explanation:

(look at the picture)

`a)\\A_{\boxed{\ }}=a\cdot b;\ a=9;\ b=8\\\\A_{\boxed{\ }}=9\cdot8=72\\\\A_\triangle=(a\cdot h)/(2);\ a=3;\ h=4\\\\A_\triangle=(3\cdot4)/(2)=(12)/(2)=6\\\\\huge\boxed{A=72-6=66}`

`b)\\A_{\boxed{\ }}=a\cdot b;\ a=15,\ b=5\sqrt3\\\\A_{\boxed{\ }}=15\cdot5\sqrt3=75\sqrt3\\\\A_\triangle=(a\cdot h)/(2);\ a=5;\ b=5\sqrt3\\\\A_\triangle=(5\cdot5\sqrt3)/(2)=(25\sqrt3)/(2)=12.5\sqrt3\\\\\huge\boxed{A=75\sqrt3-12.5\sqrt3=62.5\sqrt3}`

`c)\\A_{\boxed{\ }}=a\cdot b;\ a=3\sqrt2;\ b=3\\\\A_{\boxed{\ }}=3\sqrt2\cdot3=9\sqrt2\\\\A_\triangle=(a\cdot h)/(2);\ a=3;\ h=3\\\\A_\triangle=(3\cdot3)/(2)=(9)/(2)=4.5\\\\\huge{\boxed{A=9\sqrt2-4.5}}`