The percent increase from 18 to 26?

44.44444444 percent

Detailed

Where: 18 is the old value and 26 is the new value. In this case we have a positive change (increase) of 44.44444444 percent because the new value is greater than the old value.

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

step-by-step explanation:

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.