The sides of a triangle are 8cm, 15cm, and 17cm respectively. At each of its vertices,circles of radius 3.5 cm are drawn. What is the area of the triangle excluding the portion covered by the sectors of the circles
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Answer:
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Step-by-step explanation:
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Step-by-step explanation:
The sides of a triangle are 8 cm, 15 cm and 17 cm.
As we know,
17 = 8 + 15
289 = 64 + 225
289 = 289
Now we can say triangle is right angled triangle
Area of right angled triangle = (1/2) × Base × height = (1/2) × 8 × 15 = 60 cm2
Area Covered in triangle by 3 circles = (θ₁ /360) πR² + (θ₂ /360) πR² + (θ₃ /360)πR² = [(θ₁ + θ₂ + θ₃)/360] × πR²
As we know,
θ₁ + θ₂ + θ₃ = 180°
Area Covered in triangle by 3 circles = [(θ₁ + θ₂ + θ₃)/360] × πR² = [180/360] × [22/7] × 3.5 × 3.5 = 19.25 cm2
Area of the triangle excluding the portion covered by the sectors of the circles = 60 - 19.25 = 40.75 cm2
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