Question

Can someone help me understand this work is below

Answer 1

figure 1
4 triangles ,each of base=6 inches and height=9 inches
so area of 4 triangles\[=4\times \frac{ 1 }{ 2 }\times 6\times 9\]
\[=108~sq.cm.\]
or we can solve like this
Base of larger triangle=2 *6=12 cm
height of larger triangle=2*9=18 cm
\[area=\frac{ 1 }{ 2 }\times12 \times18=108 ~sq.cm.\]
figure 2.
\[area ~of~four~triangles=4\times \frac{ 1 }{ 2}\times 6\times 9=108~sq.cm.\]
area of square base=6 *6=36 sq.cm
now can you complete it?