Plz answer as soon as possible que 3
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3.
a. Area of the shaded region = Area of rectangle - Area of triangle = 12×10 cm² - 1/2 × 10 × 12 cm² = 1/2 × 12 × 10 cm²
= 60 cm²
b. Area of shaded region = Area of rectangle - Area of the 3 unshaded triangles = 15×12 cm² - 1/2 × 12× 6 - 1/2 × 9×6 - 1/2 × 15×6 = 180 - 36 - 27 - 45 = 180 - 108 cm² = 72 cm²
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When a simple pendulum makes 10 oscillations in 20 seconds, thetime taken for each oscillation = 20/10 = 2 seconds. Hence, as the time period is calculated to be 2 seconds, thefrequency of oscillation = 1/T = 1/ 2 = 0.5 Hertz.
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