Carl cut two triangles boards from the corners of a rectangular board as shown

Answer:
I don't see a shaded area but all the shapes together would be 52.5 cm².
Step-by-step explanation:
5 × 10.5 = 52.5
The combined area of the shaded section is [tex]52.5 cm^2[/tex]
Given that,
The calculation is as follows:
[tex]= 5 \times 10.5 \\\\= 52.5 cm^2[/tex]
Here we multiplied these two things to calculate the combined area.
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