Answer:
A ≈ 8133.27 m²
Step-by-step explanation:
Sum the parts of the ratio 6 + 7 + 8 = 21 parts
Divide the perimeter by 21 to find the value of one part
420 ÷ 21 = 20 ← value of 1 part of the ratio, hence sides of triangle are
6 × 20 = 120
7 × 20 = 140
8 × 20 = 160
To calculate the area (A) we can use Hero's formula
A =
Where s is the semi perimeter and a, b, c the sides of the triangle
let a = 120, b = 140 , c = 160 and s = 420 ÷ 2 = 210
A =
=
= ≈ 8133.27 m²
A
4+8=12 wrong
4.5+8=12.5 wrong
5+8=13 wrong
5.5+8=13.5 right
the rest of the numbers are above 5.5 so they aren't wrong
<u>5.5, 6 and 6.5 makes the inequality true
</u>
B
x+8>13
x>13-8
<u>x>5
</u>
C
<u>x=5 is not a solution to the inequality because 5+8 is not more than 13.</u>
Answer:
Step-by-step explanation:
the opposite angles MUST add upto 180.
3x-5+2x=180
5x-5=180
x=185/5=37
A=37+5=42..
So I think 96