Sanjana's answer to Alice's Primary 6 Maths Measurement Singapore question.
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Date Posted:
4 years ago
23.
angle GFC + angle GCF = 180 - 32 = 148 (sum of angles in a triangle)
angle GFC = 148 / 2 = 74 (angles in isos triangle)
angle x = angle GFC = 74 ( alternate angles)
*don't forget your degree sign, super important (I couldn't include it here)
24.
Area of square = 14 x 14 = 196
Radius of circle = 14/2 = 7
Area of circle = (22/7) x 7 x 7 = 154
Shaded area = 196 - 154 = 42 cm^2
**The formula for area of circle =
pi x radius x radius
***The formula for circumference =
pi x 2 x radius OR
pi x diameter
angle GFC + angle GCF = 180 - 32 = 148 (sum of angles in a triangle)
angle GFC = 148 / 2 = 74 (angles in isos triangle)
angle x = angle GFC = 74 ( alternate angles)
*don't forget your degree sign, super important (I couldn't include it here)
24.
Area of square = 14 x 14 = 196
Radius of circle = 14/2 = 7
Area of circle = (22/7) x 7 x 7 = 154
Shaded area = 196 - 154 = 42 cm^2
**The formula for area of circle =
pi x radius x radius
***The formula for circumference =
pi x 2 x radius OR
pi x diameter
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