# Non right triangles questions and answers Recent questions in Non-right triangles and trigonometry
Non-right triangles and trigonometry
ANSWERED ### comprehension check for derivatives of trigonometric functions: a) true or false: if $$\displaystyle{f}\ {p}{r}{i}{m}{e}{\left(\theta\right)}=-{\sin{{\left(\theta\right)}}},{t}{h}{e}{n}\ {f{{\left(\theta\right)}}}={\cos{{\left(\theta\right)}}}.$$ b) true or false: $$\displaystyle{I}{f}\ \theta$$ is one of the non right angles in a right triangle and $$\sin(\theta) = 2/3$$, then the hypotenuse of the triangle must have length 3.

Non-right triangles and trigonometry
ANSWERED ### In triangle ABC, angle B is five times as large as angle A. The measure of angle C is 2° less than that of angle A. Find the measures of the angles. (Hint: The sum of the angle measures is 180°.)

Non-right triangles and trigonometry
ANSWERED ### What does the combined length of any two sides of a triangle exceed?

Non-right triangles and trigonometry
ANSWERED ### In $$\displaystyle△{P}{Q}{R},{m}∠{P}={46}{x}$$ and $$\displaystyle{m}∠{R}={7}{x}$$, a. Write and solve an equation to find the measure of each angle. b. Classify the triangle based on its angles.

Non-right triangles and trigonometry
ANSWERED ### A tributary joins a river at an angle. Find the value of x.

Non-right triangles and trigonometry
ANSWERED ### What is the value $$\displaystyle{\cos{{\left({72}^{\circ}\right)}}}$$? Write your answer in decimals.
ANSWERED 