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Tju [1.3M]
2 years ago
7

AB and DC are parallel.

Mathematics
1 answer:
bekas [8.4K]2 years ago
6 0

Answer:

  583 cm²

Step-by-step explanation:

To find the area of triangle BCD, we need to know the length of segment BD. That can be found from the law of sines:

  BD/sin(A) = BA/sin(D)

  BD = (sin(A)/sin(D))BA = sin(70°)/sin(74°)·(39 cm) ≈ 38.1249 cm

Then the area of BCD is ...

  A = 1/2(DB)(DC)sin(BDC)

Angle BDC, together with the marked angles, makes a total of 180°.

 ∠BDC = 180° -74° -70° = 36°

  A = 1/2)(38.1249 cm)(52 cm)sin(36°) ≈ 582.64 cm² ≈ 583 cm²

_____

<em>Additional comment</em>

The angle relation we used comes from the fact that consecutive interior angles where a transversal crosses parallel lines are supplementary. That means angle DAB and ADC are supplementary. Angle ADC is the sum of angles ADB and BDC, so we have ...

  ∠DAB +∠ADB +∠BDC = 180°

  ∠BDC = 180° -∠DAB -∠ADB

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Answer:

  (c)  115.2 ft³

Step-by-step explanation:

The volume of a composite figure can be found by decomposing it into figures whose volumes are easy to compute. Here, the figure can be nicely represented as a cube and a square pyramid.

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<h3>Cube</h3>

The volume of the cube on the left is given by ...

  V = s³

  V = (4.2 ft)³ = 74.088 ft³

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<h3>Pyramid</h3>

The volume of the pyramid on the right is given by ...

  V = 1/3Bh . . . . . where B is the area of the square base

  V = 1/3(s²)h = (4.2 ft)²(7 ft) = 41.16 ft³

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<h3>Total</h3>

The volume of the composite figure is the sum of these volumes:

  cube volume + pyramid volume = 74.088 ft³ +41.16 ft³ = 115.248 ft³

The volume of the composite figure is about 115.2 ft³.

6 0
2 years ago
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vazorg [7]

Answer:

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Step-by-step explanation:

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8 0
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What is the answer to this equation “A = ?”<br><br> G(a + h) = M
sasho [114]

Answer:

a  = M -Gh/G

Step-by-step explanation:

in order to make a the subject of fomular , you will open the bracket first and then combine the like terms.

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