Determine if quadrilateral DEFG is a parallelogram using the distance or slope formula. Then find its perimeter.
D(-8, 1), E(-3, 6), F(7,4), G(2, -1)

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¯¯¯¯¯¯¯¯)?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi