Determine the perimeter of the shape below if all of its angles are equal to 90°:
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Determine the perimeter of the shape below if all of its angles are equal to 90°:
To solve this problem, we'll first examine the given shape and identify the lengths of each side along its perimeter:
Let's list the lengths of the outer boundary sides to compute the total perimeter:
Perimeter Sum of all external side lengths:
(left) (top) (bottom) (right).
.
Therefore, the solution to the problem is .
120
Look at the rectangle ABCD below.
Side AB is 6 cm long and side BC is 4 cm long.
What is the area of the rectangle?
Imagine walking around the outside of the shape. Only count the sides you would walk along! Internal lines that divide the shape don't count toward perimeter.
You're counting internal segments! The perimeter has four external sides: left (15), top (15), right (10), and bottom (15). Internal divisions don't add to the outer boundary.
The left side has three vertical segments of 5 units each, creating one continuous boundary of units total.
Look for patterns and symmetry. If one side shows 5 units and appears the same length as others, they're likely equal. Use the 90° angle clue to identify rectangular sections.
Draw the shape on paper and physically trace the outline with your finger, adding each measurement as you go. This helps avoid counting internal segments twice!
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