What do the two lines mean marked on the triangle?

A rectangle's length is 4 times it's width. The sum of its two adjacent sides is 22 cm. How long is each side?

What do I do

(-3)*(-8)

Explain one way to determine if a quadrilateral has congruent angles

The tangent ratio applies only to acute triangles true or false

How

How do you figure it out?

How do I find the distance between each pair of points

One end of the diameter of a
circle is (2,3) and the centre is (-2,5) find the coordinates of the other end

Draw a line l draw a perpendicular to l at any point l on this perpendicular choose a point x 4cm away l. Through x draw a line m parallel to l

find the distance between following pair of point

The area of any quadrilateral with perpendicular diagonals of length d1 and d2 is given by 1/2d1d2.
Show that the area of the quadrilateral ABCD where points A,b,c and d have coordinates (-1,4),(3,7),(5,2)and (-5,-17) respectively is 80 units ^2.