18. The perimeter is simply √3 + √3 + √3 + √3 or 4√3cm, since the perimeter is just all sides added together. You could add the decimal numbers together using a calculator, which I'm not sure if you're supposed to do in your class.
The area is just width times length, so √3 • √3 = 3cm².
19. The perimeter is 2√5 + 2(9 - √5).
This can also be written as 2√5 + 18 - 2√5, which leaves you with a perimeter of 18ft.
The area would be √5 • (9 - √5), which leaves you with (9√5 - 5)ft².
20. The formula for the perimeter (or circumference) of a circle is π times the diameter of the circle. Using the radius of the circle, 1/π, the diameter is 2/π, so
π • 2/π = 2. The circumference of the circle is 2 inches.
The area of the circle is calculated with the equation πr², so
π(1/π)² = π • 1/(π²) = π/(π²) = π. The area is simply π in².
The order is 1/6, 4/19, 1/2, 7/12, 7/12, and 2/3.
Because this triangle is an Isosceles triangle, two of the angles will be the same. You can tell this is an Isosceles triangle because two sides have the same length but the other does not. You can use this to make an equation. Because a triangle has 180 degrees all together, you can use the equation 2x+56=180. To solve for X you first do 180-56. You will get 124. Now you have 2x=124. You then divide 124 by 2. You will then get 62. This means X = 62 or 62 degrees. The final answer will be X = 62 Degrees.
Answer:
you need to use tracing paper for this
Answer:
x = 16
Step-by-step explanation:
If the figure is a parallelogram, the opposite sides are the same length
3x+20 = 5x-12
Subtract 3x from each side
3x+20 -3x = 5x-12-3x
20 = 2x-12
Add 12 to each side
20+12 = 2x-12+12
32 = 2x
Divide each side by 2
32/2 = 2x/2
16 =x