+0

# Help for school hw

0
256
7

1.Find the area of the convex quadrilateral with vertices (1, 5), (2, 3), (7, 6) and (7, 1).

2.A line goes through (2, 3) and (−8,−2). The line has an x-intercept of P and a y-intercept of Q. Let the origin be O. Find the area of OPQ

3.The point (−3, 2) is rotated 90◦ clockwise around the origin to point B. Point B is then reflected in the line y = x to point C. What are the coordinates of C?

May 19, 2020

#1
-2

only post one or two questions at a time like Melody says, please, and don't say help for school homework, that just means you are trying to cheat:(

May 19, 2020
#2
-2

hey hugo, what video games do you play? Just curious:0:)

May 19, 2020
#3
0

However I got 19 as my answer.

Top triangle 6*1, left 1*2, center rectangle 2*5 and bottom triangle 5*2, so we have

3+1+10+5 = 19.

May 19, 2020
edited by hugomimihu  May 19, 2020
#4
0 So I graphed the line, in red. The x intercept is -4 and the y intercept is 2. SO we have a triangle of base 4 and height 2. The triangle is 4*2/2 = 4 units.

May 19, 2020
#5
-1 So we have that.

If we turn it 90 degrees clockwise we have the rectangle with a point at (2,3).

If you don't understand anything feel free to ask!

Edited by: Me!

Markup function by: Apple

May 19, 2020
#6
0

Question #1:  On graph paper:

--  plot point A(1,5)

--  plot point B(7,6)

--  plot point C(7,1)

--  plot point D(2,3)

Connect sides AB, BC, CD, and DA to get the quadrilateral ABCD.

Now, find point E(7,5) and point F(7,3).

Draw a line segment from A to E and another line segment from D to F.

Quadrilateral ABCD is now divided into a top triangle (ABE), a bottom triangle (DFC)

and a middle trapezoid.

If we find the areas of these three figures and add them together, we will have the area

To get the area of the top triangle (ABE):

-- the base is AE (find this length)

-- the height is EB (find this length)

-- and use the formula:  A  =  ½ · base · height  =  .........

To get the area of the bottom triangle (DFC)

-- the base is DF (find this length)

-- the height is FC (find this length

-- and use the formula:  A  =  ½ · base · height  =  .........

To get the area of the trapezoid (AEFD)

-- one of the bases is FD

-- the other base is EA

-- the height is EF

-- and use this formula:  A  =  ½ · h · (base1 + base2)  =  .........

Now, add these areas together to get the total area ....

May 19, 2020
#7
+2

1.Find the area of the convex quadrilateral with vertices (1, 5), (2, 3), (7, 6) and (7, 1).

See the image here We can  use  something known as Pick's Theorem  to solve this

Note...a lattice  point  =  a  point with integer coordinates

Area =  number of boundary lattice points /2  +  number of interior lattice points  - 1   =

(4/2)    +   16  -  1   =

2   +   16   -    1     =

17   May 19, 2020