Answer:
[tex]h = 9\ cm[/tex]
Step-by-step explanation:
Step 1: Determine what h is
[tex]Area = \frac{h * b}{2}[/tex]
[tex]45\ cm^2 = \frac{h * 10\ cm}{2}[/tex]
[tex]45\ cm^2 *2 =\frac{h * 10\ cm}{2}*2[/tex]
[tex]90\ cm^2 = h * 10\ cm[/tex]
[tex]\frac{90\ cm^2}{10\ cm}= \frac{h*10\ cm}{10\ cm}[/tex]
[tex]9\ cm = h[/tex]
Answer: [tex]h = 9\ cm[/tex]
