Which of the shapes below is a type of quadrilateral? Select all that apply. A) circle
B) rhombus
C) parallelogram
D) trapezoid

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?