R= 18
d=r(2)
36=r(2)
36/2=r(2)/2
18=r
the area and circumference ones are correct. a quadrilateral has 4 sides, so that one is incorrect. hope this helps!
Answer: 6x+8
Step-by-step explanation: the number, which is the letter can be any letter you want, that doesn’t matter. So when it says six times a number, I just used x as an example. Once you have that just add a +8 because increased means add.
third angle = 80°
to find the third angle, add the 2 given angles and subtract from 180
third angle = 180° - (30 + 70 )° = 180 - 100 = 80°