PLZ ANSWER WORTH 10 points ANswer correct and I will give brainiest! ( I keep my words) PART 1

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.