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2 years ago

Pls help!!

Mathematics

2 answers:

Allisa [31]2 years ago

8 0

Answer:

Perimeter = 17a

Area = 30 square meters

Step-by-step explanation:

Perimeter = 2b + 8 = 10b + 5 + a = 15ab + 2a - b = 17a

Area = 2 + 8 = 10 + 2 = 12 × 5 = 60 simplify

I honestly don't know if this is correct, I hope it is

Mazyrski [523]2 years ago

4 0

Answer:

P = 36 cm. A = 36 $\sqrt{3}$ sq. cm. or 60.62

Step-by-step explanation:

Equilateral triangle (all sides are =)

2b + 8 = 2a - b a + 5 = 2a - b

8 = 2a - 3b 5 = a - b

Solving as a system of equation

8 = 2a - 3b Do not change

5 = a - b Multiply by -3

8 = 2a - 3b

7 = a

Solve for b: 8 = 2a - 3b

8 = 2(7) - 3b

8 = 14 - 3b

-6 = -3b

2 = b

What is the length of a side : 2(b) +8 = 2(2) + 8 ; 4 + 8 = 12

a + 5 = 7 + 5 = 12

2a - b = 2(7) - 2; 14 - 2 =12

P = 3 (sides); P = 3 (12); P = 36 cm.

A = 1/2bh , in this equilateral triangle the sides are 12 cm. So the base of the triangle is 12 and the height is 6 $\sqrt{3}$ . ( draw the height from point A to the midpoint of CB, and you have a 60 30-90 Δ Long leg equal short leg $\sqrt{3}$ . A = 1/2 (12)(6 $\sqrt{3}$ ) ; A = 6(6 $\sqrt{3}$ ) ; A = 36 $\sqrt{3}$ square cm

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