Question

URGENT
The perimeter of △NBC is 555 m.

NB = ?

m∠N = ?

Answer 1

See below in bold.

Explanation:

The perimeter = 2(2x + 90) + x = 555

5x + 180 = 555

5x = 375

x = 75

So NB = 75 m

m < N =(180 - 18) / 2

= 162 / 2

= 81 degrees.

Answer 2

NB = 75

Angle N = 81

Explanation:

The triangle is isosceles, which means NC and BC are equal.

(2x + 90) + (2x + 90) + x = 555

5x + 180 = 555

5x = 375

x = 75

So NB = 75

If two sides are equal, that means the angles are equal too. So angle N is equal to angle B.

A triangle has 180 degrees.

Let n represent angle N and angle B

18 + n + n = 180

2n = 162

n = 81