In isosceles triangle DAC, AD is congruent to AC. Kiran knows that the base angles of an

isosceles triangle are congruent. What additional

information does Kiran need to know in order to

show that AB is a perpendicular bisector of

segment CD?

choose all 4 correct answers

step-by-step explanation:

what is the figure? attach a picture.

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west