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irina [24]
3 years ago
10

What is the area of the trapezoid? [A = 1 2 (b1 + b2)h]

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
7 0
The area of a trapezium is 
A = (a<span>+</span><span>b)*h</span><span>/2
24 + 18 = 46 * 5 = 230 / 2 = 115</span>
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Step-by-step explanation: Hope this help :D, Can I have a Brainliest I really needed it please

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Step-by-step explanation:

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-6-5[-4-(6+12)]+(-5)
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Answer:

99

Step-by-step explanation:

-6-5[-4-(6+12)]+(-5)

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3 years ago
A Ferris wheel has a radius of 10 m, and the bottom of the wheel passes 1 m above the ground. If the Ferris wheel makes one comp
Morgarella [4.7K]

Answer:

y = 11 - 10cos(0.1\pi t)

Step-by-step explanation:

Suppose at t = 0 the person is 1m above the ground and going up

Knowing that the wheel completes 1 revolution every 20s and 1 revolution = 2π rad in angle, we can calculate the angular speed

2π / 20 = 0.1π rad/s

The height above ground would be the sum of the vertical distance from the ground to the bottom of the wheel and the vertical distance from the bottom of the wheel to the person, which is the wheel radius subtracted by the vertical distance of the person to the center of the wheel.

y = h_g + d_b = h_g + R - d_c (1)

where h_g = 1 is vertical distance from the ground to the bottom of the wheel, d_b is the vertical distance from the bottom of the wheel to the person, R = 10 is the wheel radius, d_c is the vertical distance of the person to the center of the wheel.

So solve for d_c in term of t, we just need to find the cosine of angle θ it has swept after time t and multiply it with R

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Note that d_c is negative when angle θ gets between π/2 (90 degrees) and 3π/2 (270 degrees) but that is expected since it would mean adding the vertical distance to the wheel radius.

Therefore, if we plug this into equation (1) then

y = h_g + R - d_c = 1 + 10 - 10cos(0.1\pi t) = 11 - 10cos(0.1\pi t)

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3 years ago
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