Question

Use Heron's formula to find the area in square yards of ABC

Answer 1

Answer:

see explanation

Step-by-step explanation:

Calculate the semi perimeter s

s = $\frac{12+11+7}{2}$ = $\frac{30}{2}$ = 15

Substitute s = 15 into the area formula

A = $\sqrt{15(15-12)(15-11)(15-7)}$

  = $\sqrt{15(3)(4)(8)}$

  = $\sqrt{1440}$ = 12$\sqrt{10}$

Answer 2

Answer:

37.95 yd^2 (to the nearest hundredth).

Step-by-step explanation:

s = (7 + 11 + 12) / 2

= 30/2

= 15

Now  plug in all the values:

Area = √ [s(s - a)(s - b)(s -c)]

= √ 15(15-7)(15-11)(15-12)

= √ 15*8*4*3

=   √ 1440

= 37.95 yd^2.