Answer:
see explanation
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°, thus
∠1 = 180° - (72 + 57)° = 180° - 129° = 51°
The right angle at the left vertex is composed of 72° and ∠2, thus
∠2 = 90° - 72° = 18°
57° and ∠3 form a straight angle and are supplementary, thus
∠3 = 180° - 57° = 123°
∠4 = 180° - (∠2 + ∠3 ) ← sum of angles in a triangle
∠4 = 180° - (18 + 123)° = 180° - 141° = 39°
Answer:
The answer should be A. Y= -4x -9
To find the y-coordinate of the vertex, simply plug the value of -b / 2a into the equation for x and solve for y.
Answer:
you would calculate angles with a protractor by using degrees.
Step-by-step explanation:
the center would be put at one corner and then u measure the side you want to know the angle of. hope this helped.
Answer:
772.2
Step-by-step explanation:
Using the method of cross- product
• 
= 
⇒ ad = bc, thus
85.8 × 9 = 11 × 70.2 = 772.2
