Answer:
area of an obtuse-angled: 14 cm²
explanation:
[tex]\sf area \ of \ triangle = \frac{1}{2} * base * height[/tex]
using the formula:
[tex]\sf \frac{1}{2} * 4 * 7[/tex]
[tex]\sf \frac{1}{2} * 28[/tex]
[tex]\sf 14 cm^2[/tex]
note: the formula for finding area is same for all obtuse triangle.
