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4 years ago

Can someone please help me I really need help please help me

Mathematics

2 answers:

zlopas [31]4 years ago

5 0

Answer:≈ 18.87 cm²

Step-by-step explanation:

Answer:

≈ 18.87 cm²

Step-by-step explanation:

The shaded area is the difference between the area of the trapezium and the semicircle.

The area (A) of the trapezium is calculated as

A = h( a + b)

where h is the height and a, b the parallel bases

Here h = 4 ( radius of circle), a = 14 and b = 4 + 4 = 8, thus

A = × 4 × (14 + 8) = 2 × 22 = 44 cm²

area of semicircle = πr² = π × 4² = 8π cm²

Shaded area = 44 - 8π ≈ 18.87 cm² ( to 2 dec. places

Colt1911 [192]4 years ago

4 0

Answer:

≈ 18.87 cm²

Step-by-step explanation:

The shaded area is the difference between the area of the trapezium and the semicircle.

The area (A) of the trapezium is calculated as

A = $\frac{1}{2}$ h( a + b)

where h is the height and a, b the parallel bases

Here h = 4 ( radius of circle), a = 14 and b = 4 + 4 = 8, thus

A = $\frac{1}{2}$ × 4 × (14 + 8) = 2 × 22 = 44 cm²

area of semicircle = $\frac{1}{2}$ πr² = $\frac{1}{2}$ π × 4² = 8π cm²

Shaded area = 44 - 8π ≈ 18.87 cm² ( to 2 dec. places )

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3 years ago

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3 years ago

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Answer:

Step-by-step explanation:

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3 years ago

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Step-by-step explanation:

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