# maths

Choose three options which are true:

a) an angle of 150 degrees is equivalent to 2pie/3 radians.

b) Cos 0 = cos (0 – pie/2) for al values of 0.

c) Sin 0 = cos (0 – pie/2) for all values of 0.

d) If triangle ABC has a right angle at B, then sin A = cos C

e) In any triangle ABC, if the lengths of just two sides of the triangle are known, then you always calculate the third.

f) In any triangle ABC,AB sin C = AC sin B

g) If triangles PQR and XYZ are similar, with P = X, Q = Y, R = Z, then XY/PQ = XZ/PR

h) In any triangle PQR, cos R = PR^2 + PQ^2 – QR^2/ 2 x PR x PQ.

would it be D and E and F ??

e is obviously false.
d is true
f is not the law of sines I learned. AB is side c, and AC is side b.

c*SinC is not equal to b*SinB.

c/SinC= b/SinB is the law of sines.

1. 👍 0
2. 👎 0
3. 👁 165

## Similar Questions

1. ### math

Altitudes AD and BE of acute triangle ABC intersect at point H. If angle AHB = 123 degrees and angle BAH = 26 degrees, then what is angle HCA in degrees? Asymptote code below [asy] size(150); defaultpen(linewidth(0.8)); pair B =

asked by bruh on December 7, 2019
2. ### Trigonometry

If the radius of a pizza is 20 cm, what is the central angle in degrees that gives one person 30 cm of crust? Question 5 options: a) 120° b) 35° c) 43° d) 86° I say option a, but my partner disagrees

asked by Muneer on June 18, 2020
3. ### Math

One angle of an isosceles triangle is 28°. What are the other 2 angles? (Choose all that apply.) 76 degrees and 76 degrees 116 degrees and 116 degrees 28 degrees and 152 degrees 28 degrees and 124 degrees

asked by Ryan on January 18, 2012
4. ### biology

Determine if the following statement is true or false. If true, choose TRUE. If false, choose the rewording that is true. Atoms of different elements come together to form a compound.

asked by Anonymous on August 2, 2019
5. ### math

The temperature dropped from - 2 degrees to - 11 degrees. How many degrees was the drop? Choose the best answer from the options below: A -13 B 13 C 9 D -9

asked by anette on May 20, 2011
1. ### math

1.Which of the following numbers are equivalent to 20%? CHOOSE ALL THAT APPLY.!! A. 0.002 B. 1/4 C. 0.20(I PICK THIS) D. 1/5(I PICK THIS) 2.which of the following numbers are equivalent to 35%?CHOOSE ALL THAT APPLY !! A. 7/20 B.

asked by Matt on February 1, 2014
2. ### math

Choose the correct classification for the angle. The angle measures greater than 90 degrees. A. acute B. obtuse C. right D. straight

asked by Street fighter on February 6, 2019
3. ### trigonometry

the pilot in an airplane observes the angle of depression of a light directly below his line of sight to be 30.4 degrees. a minute later, its angle of depression is 43.0 degrees. if he is flying horizontally in a straight course

asked by rhinechilde on August 26, 2014
4. ### Math

In parallelogram ABCD, angle B is 5 times as large as angle C. What is the measure in degrees of angle B? A. 60 B. 100 C. 120 D. 150 Its so confusing to me I know that a parallelogram adds up 180 but this is looking for one angle

asked by Nahil on August 8, 2019