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boyakko [2]
3 years ago
12

Giving brainliest! Please give me the working out for the answer

Mathematics
1 answer:
LiRa [457]3 years ago
8 0

Answer:

∠BCD is a right angle ⇒ Proved down

Step-by-step explanation:

<em>Let us revise some fact in the circle</em>

  • If the vertices of a quadrilateral lie on a circumference of a circle, then this quadrilateral is called a cyclic quadrilateral
  • In a cyclic quadrilateral, every two opposite angles are supplementary (the sum of their measures is 180°)

<em>Let us use these facts to solve the question</em>

∵ ABCD is a quadrilateral

∵ Its vertices lie of the circumference of the circle

∴ ABCD is a cyclic quadrilateral

<em>By using the facts above</em>

∴ ∠ABC and ∠ADC are supplementary

∴ m∠ABC + m∠ADC = 180° → (1)

∵ m∠ABD = m∠CBD → given

∵ m∠ABC = m∠ABD + m∠CBD

∴ m∠ABC = 2m∠CBD → (2)

∵ m∠ADB = m∠CDB → given

∵ m∠ADC = m∠ADB + m∠CDB

∴ m∠ADC = 2m∠CDB → (3)

→ Substitute (2) and (3) in (1)

∴ 2m∠CBD + 2m∠CDB = 180

→ Divide both sides by 2

∴ m∠CBD + m∠CDB = 90

In ΔBCD

∵ m∠BCD + m∠CBD + m∠CDB = 180 → Sum of angles of a triangle

∵ m∠CBD + m∠CDB = 90

∴ m∠BCD + 90 = 180

→ Subtract 90 from both sides

∴ m∠BCD + 90 - 90 = 180 - 90

∴ m∠BCD = 90°

∴ ∠BCD is a right angle ⇒ proved

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Answer: correct choice is B.

Rectangle has two axes of symmetry So an arbitrary rectangle can be reflected across two axis of symmetry so that it carries onto itself.

3 0
3 years ago
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What's 3x+5y=-7 (show step by step on paper)
Allushta [10]

Answer:

m=-3/5

Step-by-step explanation:

Simplifying

3x + 5y = 7

Solving

3x + 5y = 7

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5y' to each side of the equation.

3x + 5y + -5y = 7 + -5y

Combine like terms: 5y + -5y = 0

3x + 0 = 7 + -5y

3x = 7 + -5y

Divide each side by '3'.

x = 2.333333333 + -1.666666667y

Simplifying

x = 2.333333333 + -1.666666667y

6 0
2 years ago
Find the height of a rectangular prism if the surface are is 288 square centimetres and the base has a length of 4 centimetres a
liraira [26]
The rectangular prism below is made up of 6 rectangular faces, and the faces opposite to each other are have an equal area.
The area of one of the faces is lxh or lh, and the area of the face opposite to it is also equal, so the area of those two equal faces is 2lh.
The area of the base of the prism is lxw, and the area of its opposite face is equal, so the area of those two equal faces is 2lw.
The area of the face in the left side of the prism is wxh, and the area of the face opposite to it is also equal, so their combined area is 2wh.
So, to find the total surface area of a rectangular prism, we’d add the sum of all the rectangular faces, so the formula of finding the surface area of a rectangular prism=
2lh+2lw+2wh
=2(lh+lw+wh)
Given,
Surface area of the rectangular prism=288 cm^2
2(lh+lw+wh)=288
2[4h+(4x9)+9h)]=288
4h+(4x9)+9h=288/2
4h+(4x9)+9h=144
13h+36=144
13h=144-36
13h=108
h=108/13
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Hope this helps!

8 0
3 years ago
Michelle has 3
anyanavicka [17]

Answer: 4/5

Step-by-step explanation:

3 0
3 years ago
I will give brainliest and A LOT OF POINTS please help!!!!!!!!!!!!!!!!!
DedPeter [7]

Answer:

(10,2)(20,4)(30,6)(40,8)

Step-by-step explanation:

In each bracket the first digit divided by the second is equal to 5

10÷2=5

20÷4=5

30÷6=5

40÷8=5

3 0
2 years ago
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