Answer:
A. To help life on Earth
Step-by-step explanation:
The other options are high key dumb, and that's literally why they do it :)
A polygon with four congruent sides is a square, or a diamond. This may apply if it also has four right angles.
Another option may be a rhombus, which will apply if it does NOT have any right angles.
Remember: Congruent means the same.
Your answer is a square.
You can find a unit rate by dividing the first number by another number to get something per something.
For example, if a question asked: What is the unit rare for 100 feet for 2 seconds, it would be 100/2, so it is 50 feet per second.
Answer:
Step-by-step explanation:
<h2>
Area of shapes</h2><h3> a) Triangle</h3>
base = b = 7 km
altitude or height = h = 3.8 km
![\sf \boxed{\text{\bf Area of triangle =$\dfrac{1}{2}b*h$ }}](https://tex.z-dn.net/?f=%5Csf%20%5Cboxed%7B%5Ctext%7B%5Cbf%20Area%20of%20triangle%20%3D%24%5Cdfrac%7B1%7D%7B2%7Db%2Ah%24%20%7D%7D)
![= \dfrac{1}{2}*7*3.8\\\\= 7 * 1.9\\\\= 13.3 \ km^2](https://tex.z-dn.net/?f=%3D%20%5Cdfrac%7B1%7D%7B2%7D%2A7%2A3.8%5C%5C%5C%5C%3D%207%20%2A%201.9%5C%5C%5C%5C%3D%2013.3%20%5C%20km%5E2)
<h3>b) Rectangle:</h3>
length = l = 8.2 cm
width = w = 7 cm
![\sf \boxed{\text{\bf Area of rectangle = l*w}}](https://tex.z-dn.net/?f=%5Csf%20%5Cboxed%7B%5Ctext%7B%5Cbf%20Area%20of%20rectangle%20%3D%20l%2Aw%7D%7D)
= 8.2 * 7
= 57.4 cm²
<h3>c) Parallelogram</h3>
base = b = 9.1 km
height = h = 5 km
![\sf \boxed{\text{\bf Area of parallellogram =b*h}}](https://tex.z-dn.net/?f=%5Csf%20%5Cboxed%7B%5Ctext%7B%5Cbf%20Area%20of%20parallellogram%20%3Db%2Ah%7D%7D)
= 9.1 * 5
= 45.5 km²
<h3>d) Trapezium</h3>
Parallel sides a = 8.9 m & b = 2.7 m
height = h = 4.2 m
![\sf \boxed{\text{\bf Area of trapezium =$\dfrac{(a +b)*h}{2}$}}](https://tex.z-dn.net/?f=%5Csf%20%5Cboxed%7B%5Ctext%7B%5Cbf%20Area%20of%20trapezium%20%3D%24%5Cdfrac%7B%28a%20%2Bb%29%2Ah%7D%7B2%7D%24%7D%7D)
![\sf =\dfrac{(8.9+2.7)*4.2}{2}\\\\=\dfrac{11.6*4.2}{2}\\\\= 5.8 * 4.2\\\\= 24.36 \ m^2](https://tex.z-dn.net/?f=%5Csf%20%3D%5Cdfrac%7B%288.9%2B2.7%29%2A4.2%7D%7B2%7D%5C%5C%5C%5C%3D%5Cdfrac%7B11.6%2A4.2%7D%7B2%7D%5C%5C%5C%5C%3D%205.8%20%2A%204.2%5C%5C%5C%5C%3D%2024.36%20%5C%20m%5E2)