The rule of product states that:
So, a product is positive if and only if both factors have the same sign, and is negative if only if the factors have opposite sign.
Quadrilateral abcd is a trapezoid with what must be shown to prove that abcd is an isosceles trapezoid?
1 answer:
You might be interested in
Answer:
The measure of arc a is 86°
Step-by-step explanation:
we know that
The measure of the inner angle is the semi-sum of the arcs comprising it and its opposite.
so
86°=(1/2)[arc c+arc a]
see the attached figure with letters to better understand the problem
In this problem
Triangles ABO and CDO are congruent by SSS postulate theorem
∠AOB=∠COD
∠AOB=arc a -----> by central angle
∠COD=arc c -----> by central angle
therefore
The measure of arc a is congruent with the measure of arc c
arc a=arc c
so
86°=(1/2)[2arc a]
86°=[arc a]
arc a=86°
Answer: Number of ways
Step-by-step explanation:
When there is no replacement , we use combination to find the number of ways to choose things.
Number of ways to choose r things out of ( with out replacement) =
The number of ways to choose 8 things =
Hence, Number of ways