Need help on these two questions

[CrystalH]

Hi, I'm a high-school student and I need some help on these two questions on Mensuration. I have the answers, which are in the attached file below if you would like a reference. Would appreciate if u could share me your workings. Thank you!

 

[Dr.Peterson]

Hi, I'm a high-school student and I need some help on these two questions on Mensuration. I have the answers, which are in the attached file below if you would like a reference. Would appreciate if u could share me your workings. Thank you!

It's better to attach an image directly, rather than make people open a pdf. Here is the content:




But in addition, in order to help you most effectively, we ask you to show your own work or ask specific questions. You apparently didn't bother to read the Read Before Posting instructions, or this summary:

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Welcome to our tutoring boards! :) This page summarizes main points from our posting guidelines. As our name implies, we provide math help (primarily to students with homework). We do not generally post immediate answers or step-by-step solutions. We don't do your homework. We prefer to help...

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As it is, all I can do is to ask you some questions:

1. Have you tried using the area of the parallelogram?

2. Do you know Heron's formula for the area of a triangle?