Since it’s equilateral and all triangles add up to 180 degrees
3(3a-9)=180
3a-9=60
3a=51
a=17
So the value of A is 17 degrees
1:4 expresses the total number of apples to the total pieces of fruit purchased
Perpendicular means at 90 degree if the line is on 90 degree to the base then it is perpendicular y-axis and the slope is hypotenuse!
