Page 112 - Math Course 1 (Book 2)

Three-Dimensional Figures

MO. 10 - L1b C. How many f oors are in the skyscraper if each
f oor is 16 feet high?
Drawing Three-Dimensional You can see from the side view
Figures and top-count view that the height
of the building is 7 units.

Let’s Begin total height: 7 units × 80 feet per unit = 560 feet
number of f oors: 560 feet ÷ 16 feet per f oor = 35
f oors.

Real World Example
Answer 35 f oors
ARCHITECTURE

An architect’s sketch shows the plans for a new
skyscraper. Each unit on the drawing represents
80 feet. Draw a top view and f nd the area of the Your Turn!
ground f oor.
Real World Example

A. ARCHITECTURE An architect’s sketch shows the
plans for a new of ce building. Find the area of the
ground f oor if each unit represents 75 feet.

A. 2,250 ft 2

B. 168,750 ft 2
The drawing is two rectangles, a 4 × 6 and a 2 ×1, so
the actual dimensions are 4(80) × 6(80) and 2 (80) ×
1(80) or320 feet × 480 feet and 160 feet × 80 feet.

To f nd the area, add the areas of the two rectangles. C. 90,000 ft 2

A = 320 • 480 + 160 • 80 or 166,400 ft 2

D. 202,500 ft 2
The area of the ground f oor
Answer
is 166,400 square feet.

B. Draw a top-count view of the building.

Using the top 2 2 7 7 7
view from part A, Answer
write the number 2 2 7 7 7
of levels for each
unit of the 2 2 2 2
building.
2 2 2 5
Answer 1 2 2 5

1 2 2 5

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