Questions asked by critical monster

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• The ratio of the side lengths of an isosceles triangle is 7:7:3, and its perimeter is 190cm. What is the length of the base of the triangle?
  
• Equilateral triangle ABC. AD - its altitude. E - side's AB midpoint. What are the angles of the triangle AND?
  
• How to find a perimeter of this figure?
  
• Mass of bricks is 4,5 kg. Dimensions – 25*12*6,5 cm. What is pressure, when: a)the brick stands on the big side; b)the brick stands on the other side?