Mrs.D Math · 7th Grade

MAP LAB

Solving for Missing Side Lengths

△ Shapes — find the missing side

🗺 Real World — maps & scale drawings

△ Shapes

🗺 Real World

🎲 Mixed

△ Shapes

🗺 Real World

🎲 Mixed

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🔍 Missing Side Lengths

△ Shapes — Find the Missing Side

1

Find the scale ratio from the known matching sides.

Known sides: 3 and 6 → ratio = 3/6 = 1/2

2

Apply the ratio to find the ? side.

If ratio = 1/2 and known side = 5, then ? = 5 × 2 = 10

✓ Ratio 3/6 = 1/2 → missing = 5 × 2 = 10

🗺 Real World — Scale Drawings & Maps

1

Read the scale (e.g. 1 in = 50 mi).

2

Multiply to find actual: actual = map × scale factor

3 in × 50 = 150 miles

3

Divide to find map distance: map = actual ÷ scale factor

150 mi ÷ 50 = 3 inches

✓ 1 in = 50 mi → 3 in = 3 × 50 = 150 mi

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SHAPES

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