How many right angles are there in a cubical room? [1 MARK]

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Solution

Each corner has three mutually perpendicular lines and a cuboid has 8 corners. Hence, the total number of right angles in a cubical room is $8 \times 3 = 24$ .

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How many right angles can you count in a cubical room? [3 MARKS]

(a) How many right angles are there in a cubical room?

(b) What should be subtracted from ( $\frac{5}{12} + \frac{3}{2}$ ) to get 2?

[3 MARKS]

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