Can somebody please help me out? I really need to get this right.

(I dunno if you know how to find the area of the trapezoid, so I included this wordy directions)

Add the top/first base plus the second/bottom base together.

Multiply that with the height.

After, divide that by two.

3 cm + 6 cm = 9 cm

9 cm x 4 cm = 36 cm

36 cm /2 = 18 cm

Area of trapezoid: 18 cm^2

So using the given information about (original) larger area of trapezoid being 72 cm^2,,,

,,,we would get 1/4 if we divide 18/72.

(scale factor)^2 = (1/4)

= 1/2

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value