A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. The correct option is A.
<h3>What is a triangle?</h3>
A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. The sum of all the angles of a triangle is always equal to 180°.
The length of different sides are:



Since the length of all the sides of the triangle is not equal it is a scalene triangle.
Hence, the correct option is A.
Learn more about Triangle:
brainly.com/question/2773823
#SPJ1
Answer:5 units!
Step-by-step explanation:
.
The total measure of all the angles in a triangle is 180°.
Since there is already a 90° angle, the other 2 angles must also add up to 90°.
The only answer that fits is x = 9.
Check:
9x7 = 63°
3x9 = 27°
Add up = 90°
:)
The awnser for question 5 is 4/6