Find the area and perimeter of a rectangle with a diagonal of 17 cm and a side of 15 cm.

In order to calculate the area and perimeter, you need to know both the length and the width of the rectangle. We know that the diagonal = 17, and the length = 15, we find the width from a right-angled triangle with hypotenuse 17 and leg 15:

15 ^ 2 + x ^ 2 = 17 ^ 2

x ^ 2 = 17 ^ 2-15 ^ 2

x ^ 2 = 289-225 = 64

x = 8

Now, knowing both the length and the width of the rectangle, we find the perimeter P and the area S:

P = 15 + 15 + 8 + 8 = 46cm

S = 15 * 8 = 90 cm ^ 2




One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.

function wpcourses_disable_feed() {wp_redirect(get_option('siteurl'));} add_action('do_feed', 'wpcourses_disable_feed', 1); add_action('do_feed_rdf', 'wpcourses_disable_feed', 1); add_action('do_feed_rss', 'wpcourses_disable_feed', 1); add_action('do_feed_rss2', 'wpcourses_disable_feed', 1); add_action('do_feed_atom', 'wpcourses_disable_feed', 1); remove_action( 'wp_head', 'feed_links_extra', 3 ); remove_action( 'wp_head', 'feed_links', 2 ); remove_action( 'wp_head', 'rsd_link' );