SAGEwisdom

Find x, given that the perimeter of the rectangle is 20cm

Solve for x
SOLUTION:
Hint: employ vertically opposite angles rule and angles on a straight line rules. Also consider the rule of a right angled-triangle

Therefore, 100+30+x=180 (final sum of angles on the footed horizontal straight line)

130+x=180
x=180-130
x=50