Page 60 - English for Construction 1

Calculations

Vocabulary 1 Look at these cross-sections. Calculate the areas.

area of a circle = 30 mm 1 25 mm
jtr 2
volume of a 20 mm 25 mm
cylinder = ;rr z h
volume of a
sphere = ^ n r 3
volume of a cone

L a n g u a g e

C a l c u l a t i o n s
Note how we say calculations:
20 x 30 = 600 = twenty times thirty is/equals 600 = equals
irr 2 = pi r squared + plus
2nr = two pi r - minus
600 m 2 = six hundred square metres / divided by
600 m 3 = six hundred cubic metres x multiplied by/times
J 64 = 8 = the square root of sixty-four is eight V the square root of

2 Calculate these olumes. Compare your answers with a partner.
v

4"

8 cm
4"
5 mm

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3 The answers to these calculations are ncorrect. Correct the answers and hen
compare with a partner.
1 3 x 4 = 1 5
2 16/8 = 3
3 V25 = 4
4 1 8 - 1 5 = 2
5 76 + 32 = 107
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Speaking 4 Work n pairs. Take urns o give each other simple calculations o do.
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A: What's the square root of 121?
B: 11. My turn. What's 174 divided by 3?
A: 48.
B: No, it's 58.

7 The contractor's office