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Alenkinab [10]
3 years ago
6

Find the surface area​

Mathematics
1 answer:
juin [17]3 years ago
7 0

Answer:65

Step-by-step explanation:

So first find the base of it which is 7 time 4 equal to 28

Find the side of the triangle it's 4 time 4 divide it by 2 because there 2 side u time it by 2 which is 16

Then find the front triangle which is 7 time 3 divided by 2 since there's also two of them you time it by 2 which is 21

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Move two match sticks to make squares.
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The one in the middle and the one on the right?

Step-by-step explanation:

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Consider the quadratic equation x^2=4x-5. How many solutions does the equation have
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What's the area of this
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The answer would be 16.5
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2. Given a quadrilateral with vertices (−1, 3), (1, 5), (5, 1), and (3,−1):
zlopas [31]
<h2>Explanation:</h2>

In every rectangle, the two diagonals have the same length. If a quadrilateral's diagonals have the same length, that doesn't mean it has to be a rectangle, but if a parallelogram's diagonals have the same length, then it's definitely a rectangle.

So first of all, let's prove this is a parallelogram. The basic definition of a parallelogram is that it is a quadrilateral where both pairs of opposite sides are parallel.

So let's name the vertices as:

A(-1,3) \\ \\ B(1,5) \\ \\ C(5,1) \\ \\ D(3,-1)

First pair of opposite sides:

<u>Slope:</u>

\text{For AB}: \\ \\ m=\frac{5-3}{1-(-1)}=1 \\ \\ \\ \text{For CD}: \\ \\ m=\frac{1-(-1)}{5-3}=1 \\ \\ \\ \text{So AB and CD are parallel}

Second pair of opposite sides:

<u>Slope:</u>

\text{For BC}: \\ \\ m=\frac{1-5}{5-1}=-1 \\ \\ \\ \text{For AD}: \\ \\ m=\frac{-1-3}{3-(-1)}=-1 \\ \\ \\ \text{So BC and AD are parallel}

So in fact this is a parallelogram. The other thing we need to prove is that the diagonals measure the same. Using distance formula:

d=\sqrt{(y_{2}-y_{1})^2+(x_{2}-x_{1})^2} \\ \\ \\ Diagonal \ BD: \\ \\ d=\sqrt{(5-(-1))^2+(1-3)^2}=2\sqrt{10} \\ \\ \\ Diagonal \ AC: \\ \\ d=\sqrt{(3-1)^2+(-5-1)^2}=2\sqrt{10} \\ \\ \\

So the diagonals measure the same, therefore this is a rectangle.

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3 years ago
Write an equation for the line on the graph below<br><br> I need help on both of them
LiRa [457]

Answer:

1st one, x=-1

2nd on, y=2

Step-by-step explanation:

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3 years ago
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